Although I think I'm right in saying that the kh was slow (earlier one's were quicker?) in comparison with the rd I've always loved the sound of them. As kid's we used to see an early drumbraked 250 with a green and white bodykit and expansion chamber's come through the village every morning while waiting for the school bus. Thought it was mega until one day the guy stopped for a paper and we saw how rough it was close up. My mate and I at that time used to be obsessive about cleaning our pushbikes even polishing the spokes until they shone like chrome and couldn't understand why someone wouldn't feel the same about their motorcycle. :o